Derivative of



Patented July 7, 1942 UNITED STATES PATENT OFFICE DERIVATIVE OF 2.5-DIAMINO-L4- BENZOQUINONE Gerhard Langbein, Hofheim in Taunus, Germany, assignor to General Aniline & Film Corporation, a corporation of Delaware No Drawing. Original application November 29,

1938, Serial No. 242,919. Divided and this application July 26, 1941, Serial No. 404,152. In Germany December 4, 1937 1 Claim. (Cl. 260-396) The present invention relates to a new deriva- A mixture of 37.4 parts of 2-methoxy-5-(parative of 2.5-diamino-1.4-benzoquinone and more p y n i q particularly to the compound obtainable by con- 1000 Parts f fi Parts Of D -p densing 2 mols of 2-methoxy-5-(para-dipheny1) ylene-diamine and 8.5 parts of sodium acetate is amino-3.G-dichloro-1.4-benzoquin0ne with 1 mol 5 heated 4 f The mixture of para pheny1ene diamine filtered with suction, while hot, and the sol1d produce obtained is washed with butanol, alcohol h condensatmn 1s piefemply performed by and Water. The brown diaryl-amino-1.4-benzoheating the components in a. diluent, such as an quinone containing two quinone nuclei dyes wool organ? and, 1f desned, m the Presence 10 in a colorless vat intense black-brown tints. It of an acld bmdmg agent has the following probable constitution:

01 01 NH 0 NH o -0 not 01 1 This application is a division of application I claim: Serial No. 242,919, filed November 29, 1938. The compound of the formula:

11 11 /NH\ o /NH 0 0/ NH 0/ NH- The following example serves to illustrate the being a brown product which dyes wool in a colinvention, but it is not intended to limit it thereorless vat intense black-brown tints. to; the parts are by weight: GERHARD LANGBEIN. 

